Answer:
Sine; [tex]h = l\cdot \sin \theta[/tex]
Step-by-step explanation:
The figure is included below as attachment. A right-angled triangle is formed by considering the variables mentioned in the statement of the problem. The trigonometric function that uses all the mentioned variable is the sine, which is:
[tex]\sin \theta = \frac{h}{l}[/tex]
Where:
[tex]\theta[/tex] - Angle of elevation of the sun.
[tex]h[/tex] - Height of the kite off the ground.
[tex]l[/tex] - Length of the kite string.
The height of the kite can determined by clearing the corresponding variable in the previous formula:
[tex]h = l\cdot \sin \theta[/tex]